Stop-valve for steam and other fluids.



No; 326,276. y PATENTBD JULY 1v, 190s.

J. ROBINSON.

STOP VALVE POR STEAM AND OTHER FLUIDS.

APPLICATION FILED DBO.1 1905.

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JAMES ROBINSON, OF LEEDS, ENGLND. STOP-VALVE FOR STEAM ANYD OTHERFLUIDS.

Specification of Letters Patent.

Patented July 17, 1906.

Application led December 15, 1905. Serial No. 291.816.

tight, especially when used for high-pressure steam, Owing to thescoring or cutting action of the steam upon the working faces of thevalves which takes place when the said valves are just being opened andclosed.

Now the object of this invention is to construct or arrange a stop-valvein such a manner as to entirely obviate the disadvantage above referredto.

To this end my invention broadly consists in employing a valve-body ofsimilar construction to that of an ordinary globevalve and providing thevalve-spindle with an inverted-cup-shaped or other valve adapted toengage with a corresponding tapered circular passage formed in thecenter of the internal partition of the valve-body, the said valve beingso arranged that when drawn upward by the valve-spindle a fluidtightjoint is made between the valve and the walls of the circular passage,while below the valve is employed a iiexibly-mounted cup-shaped or othershield adapted to receive thevalve on the same being lowered, the saidshield being so arranged that its rim orupper edge engages a seating onthe under side of the internal partition around the central circularpassage, so as to protect the working face of the valve against theaction of the steam.

In order that my invention may be clearly understood, I will proceed todescribe the same with reference to the example shown in theaccompanying drawings, in which similar numbers of reference indicatelike parts in all the figures, wherein` Figures 1, 2, and 3 are eachsectional side elevations of my improved stop-valve, illustrating,respectively, the valve and its shield in the closed position, the valvemoved down within its shield, and the valve and its shield moved downinto the fully-opened position.

In the drawings, 1 is the valve-body, provided with a head 2, throughwhich is passed the valve-spindle 3, formed with a left-handscrew-threadand being provided with a handcircular passage 9 wheel 4, while thebottom of the valve-body l is fitted with a detachable cover 5.

6 is the partition formed within the' valvebody 1, between the inlet 7and the outlet 8,

while through the center of the partition 6 a tapered circular passage 9is formed, having the widest part of its taper facing downward.

10 is the valve proper, of inverted-cup formation, formed integrallywith the valvespindle 3, which valve 10 is made of such a taperexternally that when it is drawn upward by means ofthe valve-spindle 3into the tapered passage 9 a fluid-tight joint will be made between thesaid valve 10 and the wall of the said passage 9. Below the valve 10 isa cup-shaped shield 11, provided with a circular base-stem 12, adaptedto slide vertically within a circular recess 13, formed in the bottomcover 5, which shield 11 is normally held up by means of a spiral spring14 with its rim engaging a seating 15, surrounding the circular passage9, so that a fluid-tight joint is made between the rim of the cup-shapedshield 11 and its seating 15.

In Fig. 1 the stop-valve is shown with its operating parts in the closedposition, the cup-valve 10 being drawn tight into the circular passage 9and the held in the up position by the spring 141 tight against theseating 15, and it will be observed that both the valve 10 and theshield 11 are arranged to open against the fluidpressure, and that suc'hpressure acting on the back of the shield 11 will when the valve 10 isclosed keep the said shield 11 hard up' to its seat 15.

In opening the valve by rotating the valvespindle 3 the cup-valve l0 isfirst traveled down into the shield when by the continued rotation ofthe spindle 3 the shield 11 is forced from its seating 15 and traveleddown simultaneously with the valve 10 into the position shown at Fig. 3,thus allowing the fluid to rush through the without doing damage to thewall of the said passage 9 or to the external face of the cup-valve 10,the latter being now sheltered within the protecting-shield 11. When thevalve is being closed, the reverse action takes place-that is to say,the shield 11 first comes to rest on its seat 15 and cuts off the rushof fluid through the circular passage 9 before the cup-valve 10commences to leave the shelter ofthe shield 11.

Should any difficulty be experienced in 11, as shown at Fig. 2,

cup-shaped shield 11 ICO reg

IIC

' when the valve is closed, so that in the latter in the bottom cover 5for allowing any condensed fluid to escape from beneath the basestem 12cf the shield 11.

When the stop-valve is used with hot fluids, the valve-spindle 3 will beliable to eX pand when the valve is open and contract case the tendencywill be to draw the cupvalve 10 farther into the circular passage 9 andrender the valve more secure against leakage.

In large valves the cup-valve 10 instead of being formed integrally withthe valve-spindle 3, as shown, may be flexibly attached to thevalve-spindle 3 in order to insure the said valve 10 making a true 'litwith the wall of the passage 9.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. A stop-valve for steam and other fluids, comprising in combination avalve-body having an internal partition formed with a tapered circularpassage, a valve-spindle carrying a tapered circular valve adapted toengage within the corresponding tapered passage in the internalpartition, and a circular shield flexibly mounted in the valve-body withits rim engaging a seatingformed on the internal partition around thecircular passage, said shield being adapted to first receive the valveprior to being carried off its seating on the valve being opened andfirst to come to rest on its seating on the valve being closed,substantially as set forth.

2. A stop-valve for steam and other fiuids, comprising in combination avalve-body having an internal partition formed with a tapered circularpassage, a valve-spindle carrying an inverted-cup-shaped valve adaptedto engage within the corresponding tapered circular passage in theinternal partition, and a cup-shaped shield located below the valve andbeing flexibly mounted in the valvebody with its rim or upper edgeengaging a seating formed on the under side of the internal partitionaround the circular passage, said shield being adapted to first receivethe valve prior to being carried off its seating on the valve beingtraveled downward and first to lcome to rest on its seating on the valvebeing traveled upward, substantially as set forth.

3. In a stop-valve for steam and other fluids, the combination with thevalve-body 1 having an internal partition 6 formed with a taperedcircular passage 9, of a valve-spindle 3 carrying an inverted-cup-shapedvalve 10 adapted to engage within the circular passage 9 of the'internal partition 6, and a flexibly-mounted cup-shaped shield 11 forthe valve 10 adapted to engage a seating 15 formed on the internalpartition 6 of the valve-body 1, substantially as and for the purposesset forth.

In witness whereof l have hereunto set my hand in the presence of twowitnesses.

JAMES ROBINSON.

Witnesses JOHN JowETT, Crnis. GILLIARD.

